<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Sustainability Timeline Explorer</title>
    <link rel="stylesheet" href="styles.css">
    <link href="https://cdn.bootcdn.net/ajax/libs/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
</head>
<body>
    <header>
        <h1 id="page-title">可持续发展历史演进时间轴</h1>
        <div class="controls">
            <button id="lang-toggle" class="btn">
                <i class="fas fa-language"></i>
                <span id="lang-text">English</span>
            </button>
            <button id="download-btn" class="btn">
                <i class="fas fa-download"></i>
                <span id="download-text">下载时间轴</span>
            </button>
        </div>
    </header>

    <main>
        <div class="timeline-container">
            <div class="timeline" id="timeline">
                <!-- Timeline content will be generated by JavaScript -->
            </div>
        </div>
    </main>

    <div id="modal" class="modal">
        <div class="modal-content">
            <span class="close">&times;</span>
            <h2 id="modal-title"></h2>
            <div id="modal-body"></div>
        </div>
    </div>

    <script src="script.js"></script>
</body>
</html>
